单项选择题

If the turbocharger of a four-stroke/cycle diesel engine fails to operate, which of the following statements best describes the probable effect?（）

A.Intake manifold pressure will be high
B.Intake manifold pressure will be unaffected
C.Exhaust temperatures will be high
D.Exhaust temperatures will be low

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The best tool to use for removing the carbon ridge at the top of an enginecylinder, prior to removing the piston, is to use（）

A.an electric grinder
B.a metal scraper
C.a reamer
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单项选择题

Which of the following problems can cause an above normal air temperature to develop in the intake manifold of a turbocharged and after-cooled diesel engine?（）

A.Faulty turbocharger turbine diffuser ring
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单项选择题

Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?（）

A.Excessive piston blow-by to the manifold
B.Insufficient cooling water flow
C.Accumulated water in the air boxes
D.Clogged air intake filters